Re: [Xen-devel] [PATCH] x86/mm: Split read_cr3() into read_cr3_pa() and __read_cr3()

[Ingo Molnar <mingo@xxxxxxxxxx>]

* Andy Lutomirski <luto@xxxxxxxxxx> wrote:

> The kernel has several code paths that read CR3.  Most of them assume that
> CR3 contains the PGD's physical address, whereas some of them awkwardly
> use PHYSICAL_PAGE_MASK to mask off low bits.
> 
> Add explicit mask macros for CR3 and convert all of the CR3 readers.
> This will keep them from breaking when PCID is enabled.
> 
> Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> Cc: xen-devel <xen-devel@xxxxxxxxxxxxx>
> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
> ---
> 
> Hi Ingo-
> 
> I broke this out because Tom's SME series and my PCID series both need it.
> Please consider applying it to tip:x86/mm.
> 
> I'll send PCID v2 soon.  It'll apply to x86/mm + sched/urgent + this patch.

Ok, thanks - will push it out after a bit of testing.

Note that I also merged sched/urgent into x86/mm, to create a better base tree 
for 
the PCID changes by picking up 252d2a4117bc that PCID depends on.

Thanks,

        Ingo

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